Detecting the First Hydrostatic Core with Deep 70 micron Imaging

Details Detecting the First Hydrostatic Core with Deep 70 micron Imaging Detecting the First Hydrostatic Core with Deep 70 micron Imaging

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50536e&link_type=abstract

Spitzer Proposal ID #50536

Computer Science

Scientific paper

We propose to complete deep 70 micron imaging of 7 first hydrostatic core (FHSC) candidates. Intermediate between the prestellar and Class 0 protostar phases, the FHSC is a transient, quasi-equilibrium core of molecular hydrogen accreting from the surrounding dense envelope; the lifetime of this FHSC is only 1e3 - 3e4 years. The FHSC phase has not yet been observationally verified, and MIPS is the only far-IR instrument currently sensitive enough to detect it. Candidates are chosen from a sample of dense starless cores in the Perseus, Serpens, and Ophiuchus molecular clouds, which was assembled using the combination of Spitzer IRAC and MIPS maps from the c2d Legacy program and Bolocam 1.1 mm continuum maps. We intend to integrate down to nearly the confusion limit at 70 micron, with a 1 sigma rms of 1.5 - 2.8 mJy and improved sensitivity over previous c2d maps by a factor of 10. The proposed observations are sensitive enough to detect a FHSC over more than 70% of its lifetime, based on predictions from radiative transfer models. Predicted fluxes from these models suggest that deep 70 micron imaging will either confirm the existence of this short-lived phase of the star formation process, or place strong constraints on the presence of a FHSC in these targets. This is a relatively high-risk, high-gain project that requires the unique capabilities of the cold Spitzer 70 micron array.

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